java写⼀个⽅法返回值是Map类型
写⼀个⽅法返回值是Map类型：（通过控制台 写进去⼀⾏字符，分别统计出其英⽂字母，空格，数字和其它字符 放到对应的list⾥⾯，最终把list放到Map⾥并返回)
最近⽼遇到问这个问题的⼈，我觉定写个蠢⼀点的办法满⾜⼀下⼤家
import java.util.*;
public class demo1 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String arr = in.nextLine();
System.out.println(demo(arr));
}
public static Map<String, List> demo (String arr )
{
String[] arrs = arr.split(" ");
Map<String,List> map = new HashMap<>();java的tostring方法
List<String> list1 = new LinkedList<>();
List<String> list2 = new LinkedList<>();
List<String> list3 = new LinkedList<>();
List<String> list4 = new LinkedList<>();
for (int i=0;i<arr.length();i++){
if ((arr.charAt(i)>='a'&&arr.charAt(i)<='z')||(arr.charAt(i)>='A'&&arr.charAt(i)<='Z')){
Character character = arr.charAt(i);
list1.String());
}
else if ('0'<=arr.charAt(i)&&'9'>=arr.charAt(i)){
Character character = arr.charAt(i);
list3.String());
}
else if (' '==arr.charAt(i)){
list2.add(" ");
}
else {
Character character = arr.charAt(i);
list4.String());
}
}
map.put("character",list1);
map.put("space",list2);
map.put("other",list4);
map.put("number",list3);
return map;
}
}